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Today I learned about a thing in SQL Server called INNER LOOP JOIN.
What does this mean? (Google is not helping .. or should I say … the blog posts about it are a bit .. technical and are blowing my mind).
Also, what are some common scenarios that would be a good idea to use an INNER LOOP JOIN over a standard INNER JOIN?
LOOP | HASH | MERGE are Join hints, specifying that the join in the query should use looping, hashing, or merging. Using LOOP |HASH | MERGE JOIN enforces a particular join between two tables. LOOP cannot be specified together with RIGHT or FULL as a join type.
You should always use INNER JOIN. Let the query optimizer decide whether it wants to do a LOOP, MERGE, or HASH join. In almost all cases the optimizer will make a better judgement. Which one will be used and when can be found from my presentation http://sqlbits.com/Sessions/Event4/Understanding_Graphical_Execution_Plans.
(Edit: The link to the video presentation on that page is broken, but Archive.org has archived it here)